Locomotive-boiler furnace.



UNITED STATES PATENT OFFICE.

CHARLES B. MOORE, OF EVANSTON, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS,

TO AMERICAN ARCH COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELA- WARE.

LOCOMOTIVE-BOILER FURNACE.

Application filed Februany 14, 1912.

10 locomotive boiler `furnaces and ha's particu lar reference to improvements in refractory defiecting Walls or baffles, commonly called arches for the fireboxes of locomotive boilers.,

The general objects of my invention are to provide a refractory arch for locomotive boilers which shall be o f light weight and low cost; to provide an arch which can be easily and quickly installed; to provide an arch which can be readilyrepaired and parts of which can be easily removed to give access to the firebox sheets for effecting repairs; and to provide an arch of suoli a form that it shall materially assist in the 0 commingling and admixing of the irebox gases.

A further object of my invention is to provide a refractory arch particularly adapted for installation in locomotive boiler tireboxcs which are equipped with water circulating or arch tubes.

My invention consists in a refractory arch having the characteristics mentioned and comprising the associated structures and combinations of parts by which the above and other objects are attained and all as hereinafter described and pointed out in the claims.

My invention will be more readily understood by reference to the accompanying drawings which form part of this specification and in which;

Figure itis a central longitudinal section of a locomotive boiler Iirebox Iequipped with a refractory arch, the whole embodying my invention; Fig. 2 is a horizontal section of the lirebox o the line 2-2 of Fig. l; Fig. 3 is .'1 vertice transverse section of the'firebox on the line 3-3 of F ig.\1; Figs. 4 and 5 are v.detail transverse sections of the arch on the'lines 4 4 'and .5-J respectively of '-Fig. 2.; 'Fig'. (risa perspectiveViewof'oney ofthe refractory .supporting 'n1e1nbcrs;and

Fig. 7 is detail lfongitudinal section ofthe arch;

Specification of Letters Patent.

Lsupport a third le f or 'holdsthem in spaced re ation and? Patented May 4, 1915.

Serial N0. 677,567. My immane capable 0f embodiment in arches occupying differing positions and having various advantageous features and although I have. chosen to liinit the illustration of my invent-ion to so-called front arches, it should be understood that my invention is not limited to this specific form of arch. So-called front arches usually oc cupy inclined positions in the forward end of the lirebox in contact with or spaced slightly from the flue sheet and they'serve as detlectin walls or baffles positioned between the fuel bed and the filles whereby the firebox gases are caused to Howbackward and` forward in the iirebox before they by orced to distribute their heat throughout the length of the crown sheet. '.Fro'nt arches which embody my invention not only have these desirable features, but .they also serve to admix or commingle th'e'firebox gases as the gases How upward tlrough the tirebox and thereby serve to effect substantially complete combustion of the fuel before the gases escape from the lirebox. i

A. locomotive lirebox as shown in the drawings consists of a flue sheet 2, side sheets 3, 3, a rear .sheet 4 which containsa lire door or opening 5 and a crown sheet 6. The tire box is provided as usual at its lower end with a grate 7. Flucs 8 lead forward from the flue sheet. The firebox shown is equipped with a plurality of water circulating tubes 9, same leading upwardly and rearwardly from the lower part of the flue sheet to the upper part of the rearsheet and serving to increase the circulation of water between the frontand rear water legs .of the boiler. The firebox shown contains two of the water circulai tubes 9 each thereof arranged about midiigay between the center of the firebox and a side sheet and my novel refractory arch consists of vtwo side leaves A each supported by one of the tub sA and each of less width than half the widt? .of the Firebox, the outer ends of these leaves esca-tpe through the flues and they are thereareipositioned against the respectiveside',`1 sheetsof the ireboxand their innemend-S Bart B which par@ spaces the inner en s of e leavesapart mid- Serv' tb till this Shar-e between the ends.

Each of the three parts ofthe arcli'icon sists of a. plurality of refractory bricks lim-r ited lnsizcby the features that they shall y box gases.

I ing pocket or vdepression .18.

not-be too heavy to be readily placed in position and that they shall not be too large to be readily passed through the tire door into the irebox. The leaves A. consist of refractory 'supporting members or bricks 10 and refractory cover bricks 11. The supportin bricks 10 are long enough to reach from t e side sheet to the inner edge of the leaf and I usually place these in upwardly and inwardly inclined positions resting at their outer ends against the side sheet of the firebox and supported adjacent their inner ends upon one of the water circulating tubes. `In the drawings this tube is shown as located at aboutone-third of the length from the inner end of the supporting members 10.

The su porting members form what may be'term trusses and they are of greatest depth at the point where they rest upon the tubes and are tapered from this point toward each end. In other words these supporting members form cantilevers' which are in a sense balanced upon the tubes and are held in position thereon by means of supporting lugs 12 which are secured to the side sht.

'.I'he'outer ends 13 of the members 10 are provided with suitable sockets or holes 14 for receiving these supporting lugs arid the lugs consequently serve to prevent both upward vand downward m ment of the outer ends of the supporting members. I preferably provide the underside of these refractory supports 10 with gas mixing pockets 15 which extend nearly thewhole length thereof and which serve to add to the eiciency of the arch in its commingling eiect upon the fire- 'These supporting. members 10 are spaced apart longitudinally in the firebox and are held in their spaced relation by means of the cover or arch bricks 11 and for the purpose of securing these various brick members in theirproper relative positions, the supporting members are provided with longitudinal gaines or grooves 515 in their upper edges and the cover members are provided with anges 16 which enter these gaines and are supported thereon. The end surfaces 17 of the cover members are adapted to contact with the side faces of thesupporting members and thereby retain theysupporting members securely Ain position.

In order to increase the gas mixing eie'ct of the :arch asffavhole, I provide each of the cover membe'rs with a shallow gas mix- As clearly illustrated in Fig.' 7 the covenmembers are Y positioned between the upper edges of the sov supporting members and consequently the .upporting members which are relatively' eep provide an arch with transverse gas mixing pockets orrecesses L? of considerable depth. I usually proportion these various `brick members that several, preferably three of the cover bricks are positioned4 be- It will be ap arent that arts of can be removed) p ,whicli can be installed or built with the ex' tween each two of the supporting members and serve to fill the space between the side sheet and the inner ends of these supporting members.

The part B of the arch comprises a plurality of the cover bricks 11 supported at their ends upon the inner ends of the' parts A, the flanges 16 of these bricks resting upon the upper surfaces of the side leaves A. It will now be seen that thearch may be termed a two brick arch as it consists of two forms of bricks, the supporting bricks 10 and the cover or top bricks 11. It also consists of three leaves, two of which are positioned in upwardly and inwardly i'inclined positions and the other is arranged between the inner ends thereof, spacing these two inclined leaves apart and filling the space between them.

In building arches in accordance with my invention, I first place two of the supporting bricks in position one upon each of the arch tubes 9 and adjacent to their lower ends close to the flue sheet and I holdy their outer ends in position by means of lugs 12 which enter the sockets 14 and rest the inner endv of each of these bricks upon lor against a spacing brick- 20, which rests upon and is supported by one of the tubes. These spacf, ing bricks hold the arch in spaced relation from the lue sheet.

To' further complete the'arch I place a. second pair of supporting bricks in proper inwardly and upwardly inclined positions above the first'pair and I retain them in 100 their positions by means of the cover bricks 11 which I place between these supporting bricks. The two parts of the arch thus formed one at each side of the firel'iox are held in spaced apart relation and against the side sheets by the cover bricks' which are placed between their inner ends. 'It some times occurs` that an arch of the le h described is sufficient to produce the es'ued results in the economical burning. and of the fuel but usually the arch extends fr `r|p-.` the vflue sheet to about the middle of the" firebox and is usually composedl of three pairs of supporting bricks arrn ed as shown in the Idrawings at each s e and spaced apart by two rows ofthe coverbricks.

theparch f without disturbing the arch as a whole for purposes of repairing the arch and also when it is desired to ele'ct repairs upon the firebok itself.

My arch bein formed of a plurality of individual mem rseach of which can be readily handled and placed in position is one iis penditure of' comparatively little time and labor. I. i

A further advantageous feature to be noted resides in the fact that the center por' tion of the arch is raised above the side potwww tinus thereby forming an arch Qarticuary adapted for uw in relaxivsjf remx or zv-irrbxes in which the arm tubes are rmzimcivey inw, theraising uf ghe mid fe port-ion of the argh fizrnih@ sagiciam space beneath the arffie for the noper circuiaion and combust-imi nf the hrebcx Furthermore, iw ini'rmzion (if the side leaves of the ai'h serve tu deeft the rining gases toward the center portion of the fire' box from each side and themby serve to thoroughly break up .any tendency which they may have to bratify;

It is further to be nod that the miidie leaf B of the arch being fdrmed of the cover bricks sx-'bieb are provided with gas mixin pockets or rovides a iwf wbir presents many subsidiary daeiciing sur faces and gas mixing pas is.

As many micatims mi my im'ention wil readily suggest themseew to one skiled -in the art, I di) not limi?, ai confine my inventiml tu the struciurfzs herein shown and dcribed;

Having thus dencrw my invention, l', Chim as new and to secure by Let tem Patent:

L A locomtive, banner mbox havingtwo substantially pame water circaiating tubes, in comhinatiexi rih a refraemry auch extending Ex side sheet in side sheet, said arch mmirsing two oppositely inclined leaves mail mid leaf being of less Width than half tha Width of ih@ firebox, supported by one of nai tubes and having its outer end meting against, a side sneek, and a third refrwtorv leaf intrpd mtwn and supported by the nnr ends of the first mentioned leaves, each of said rst mentioned leaves comprising 11. puraity of refractory supporting memikrs extending transversely' of the iremx spm apart kmgitudinally therein and a pluralityof wrm members interpoed between, gupporte by sind closing the Spaces between said refracwry supporting member@ said third Ieaf being composed of a pnraijv of refractory bricks similar in .form and shape to the ref fmdmry spacing members in the sick. leaves.

2, A iocomoive boiier fix-@box having two water cirvniating tubes therein in combina tion 'with u refracory arch therein Support ed bj; said tubes and comprisingr a Iasi at each side extending from the Sida sheet t0- ward the mdfe of the box and resting upon one of ih@ times. Said eaves being mmfmsfed party of relaiiveiy lung narrow bricks tapared in thickness transverfely of the firaox and each being of greatest thickness at he line above the tube upon which 3 n asts moi inne? fm frfpxm w 1 them.

fion with a rcfmszmy :mais herein support @d by said tubes :m mprisjn leaf at nach side extending from the si( e sheet f0- Ward the mfdl if me. bnr; :and resting upon one of tbn tubing said lamina bring com pafrty of relativa@ ifa/ng narrow bric tapenned in hickns rnsv dy of the re. bsx ami awk being; ui gwzmm thickness at th@ line a'xm'e t 127- mbe upon which it rests, rmi bricks inta-frggmfdebd between said long nam@ bricks vunitair.'mg; them in spaced reiatifm and ing me @new between them, and n series of similar mi brick? inposed be me@ the inner en@ of said leaves rest upon thf: innar ends of the ong bricks an the inicial-prism 'mi brink?, maintaining said lwves separated and closing #he space be tween than.

In a ncsmiv@ heier Em box having im; ongimimiy armnggmfined einem Eating tubes in combination wh a mfrawry front arch ihm'eim-l exmiing imm side shee w sida?, shaft :Hring 'upon and suppurted by mld when sind :arch mmn'namg an upv ,wardly and inwzrrr' imziined swion at each side snpprmed at im sauter elige 'upn a side eiw; and Nesting ndg'wm. m its inner edge upon the a'ciianent tribe, the inner ends of said wcions bei; sinned. apart and re- -frarftmjv bricks bri ging sain space. each side marien "ming mada up ci a number of transveme'y arrange@ reiaiz's-fly deep Sapfm'ting bricks span@ apart cu'fgitudnally of time rn bex, @Kwai in length zo the transf in@ spaces there 

